Digital Principles & Logic Design

Section 6.8 - Generic Array Logic Devices

The Generic Array Logic or GAL device is another type of configurable PAL device. GAL devices are intended as pin-to-pin replacements for a wide variety of PAL devices. It is designed to be compatible, all the way to the fuse level, for any simpler PAL which can be directly implemented in the GAL device. In this device, the OR gate is considered to be a part of a macrocell to obtain various types of I/O configurations found in the PAL devices that it is designed to replace.

Another family of devices that are intended for PAL replacements are programmable electrically erasable logic or PEEL devices. Its output macrocell can be programmed for numerous types of I/O configurations.

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